Carburetor



Feb.- 17, 1931. M. WARLAY CARBURETOR Filed May 9, 1929 2 Sheets-sheaf. 1

41 1 5777 ac /.V Ma/aaa/ M. wARLAY CARBURETOR Feb. 17, 1931.

Filed May 9. 1929 2 Sheets-Sheet 2 n 1 1 I 1 I u 1 Patented F eh. 17, 1931 UNITED STATES PATENT oFFICE MILAN WARLAY, OF ZAGREB, J'U'GOSLAVIA, ASSIGNOB OF ONE-HALF T0 MILIVOJ' J. GALOVAC, OF ZAGR-EB, JUGOSLAVIA GARBURETO R- Application filedMay 9, 1929, Serial No. 361,715, and in Germany March 7, 1929.

lVith the carburetors as designed up to W the amount of air sucked in by the niotor is regulated by a throttle valve located in front of that place which the fuel is supplied to the combustion air. According as a smaller or larger amount is sucked in in dependency of the position of said valve the velocity of the air varies just at said place, and this is detrimental to the distribution of the fuel sucked in by said air.

Now, this drawback is obviated, according to the present invention, by arranging the fuel exit aperture i. e. that aperture through which the fuel enters intothe air supply pipe, at a placewhere there-is provided a slide valve ora throttle valve for varying the sectional area of said pipe in order to regulate the amount of the combustion air. Besides, the amount of the fuel supplied to the air is accommodated to the respective amount of the air, at the time being, by the movement of the valve controlling the air supply.

A particularly advantageous constructional form of the improved carburetor is distinguished by the feature of arranging the orifice of the fuel supply conduit, and the valve regulating the amount of the fuel, in that valve by which the amount of the air is controlled. In this case the position of the fuel valve is accommodated, at the time being, to the position of the air valve by means of an adjustable oblique surface along which the fuel valve needle can slide. This constructional form is distinguished by its quite extraordinary simplicity and the smallness of the space required.

Anotherdevelopment of the invention resides therein that under the action of the reduced pressure produced during the suction stroke when the motor is in operation the needle valve is laid against the before-mentioned oblique surface, whereas when the motor is at a standstill a spring presses the valve needle onto the valve seat so that the valve is closed and 110 fuel can leave the carburetor.

The invention is illustrated diagrarnmatrcally and by way of example in the accompanying drawings in which Figure 1 is a side-view of a carburetor designed according to this invention; Figure 2 is a frontview thereof; Figure 3 is a plan, the protective hood of the carburetor being removed; Figure 4 is a section in the plane AB of Fig. 1 Figure 5 is a section in the plane C-D of Fig. 2; Figure 6 is a section in the plane E-F of Fig. 3; Figure 7 shows the righthand part of the upper part of Fig. i, drawn to an enlarged scale; Figure 8 is a section similar to Fig. 4 and shows a modification; and Figure 9 is a view of the carburetor attached to a motor cylinder, all as more fully described hereinafter.

1 denotes the casing of the carburetor, and 2 a detachable protecting hood thereof. 3 is a branch serving for connecting the carburetor with a pipe by which it is connected with the motor cylinder M. The casing l is provided with a guide groove l, the opposite walls of which are of convex shape, shown in Fig. 2. I wish it, however, to be understood, that this is merely an example. Instead of the convex guide walls such walls of another sectional shape, for instance of angular shape, may be chosen. In the groove 4 a' slide 5 can be moved. Those faces of this slide which contact with the convex (or otherwise shaped) faces of the guide groove are shaped accordingly to besupplements thereof. Into the rear face of the slide is screwed an eye 6, to which is jeinted a lever operated either by a governor or by the gas lever or by any other suitable member. ccording to the position of the slide 5 in the guide slot 4= the opening 7 through which the combustion air can enter into the branch 3 in the direction of the arrow a is smaller or larger.

Into the slide 5 terminates the fuel supply pipe 8 which is elastic, and hinged to the slide 5, so that it cannot impede the movements of the same. lVithin the slide 5 is provided an angular passage 9, the end of which forms valve seat 10 c'o-operating with a needle valve 11, treated more fully hereinafter. In the slide 5 also a passage 12 is provided which terminates'at the front-face of the slide and communicates with the passage Slat the valve 'se'at'l'OI At the rear end of the passage 12 a bore 13 for the additional air is provided.

The needle valve 11 is subjected to pressure exerted by a spring 14: acting upon the piston-like collar ll of said valve and pressing it firmly upon the seat 10 when the motor is at a standstill so that no fuel can escape from the conduit l. The spring 14: and the piston 11 are arranged in a cylindric bore 15 of the slide This bore communicates by a passage 15" with the conduit 3 which leads to the motor cylinder. As soon as in the conduit '3 a reduced pressure arises during the suction stroke of the motor, that reduced pressure is propagated through the conduit 15 to the space 1.3, in consequence whereof the rear end of the needle ll is caused to contact with an oblique control surface 16 counter to the action of the spring 14. The member 16 having this surface is turnably supported in the block 5% on a pivot 17 which has a little play in order to prevent the valve 3i t 1H and the needle ll from beiu da ed in the upper end-p0 l or 16" which i g provided with an abnti'mnt 19 .u

c action of a spring 20 by the inter of a ball Si. in this manner the lower end of the lever 16 is placed against the point of an adjusting screw 22, by which the obluity of said lever is determined according to its position. The block 18 in which the lever 16" and the means determining its position are supported is shiftably arranged in a recess of the casing 1. By moving said block in the direction indicated by the double arrow Z) (Fig. 4;) the oblique surface of the lever 16 can be uniformly approached to the slide 5, or moved away from it. in its entire extent. For regulating the position of the block 18 a screw 23 is provided, the enlarged lower end 2% of which engages a recess 25 of the block 18. Said screw is arranged in a holder 26 attached by screws 2'? to the casing 1.

In order to render possible the introduction of the slide 5 with needle-valve 11 into the guide slot 4 one of the lateral walls of this slot is provided with a groove 28 (Fig. 2).

The modification illustrated in Fig. 8 differs from that above described in this way that the needle 11 is not pressed against the valve seat by a spring, but there is a spring 29 by which the valve is continually kept in contact with the guide surface 16. The spring 29 is fastened to the slide 5 by means of a screw 30.

The manner of operation of the arrangement and combination of parts as described is as follows:

By shifting the slide 5 in the guide slot 4% the air inlet opening 7 is enlarged or its size is reduced. The valve needle designed as shown in the Figs. l. 6 and 7, is placed e f e 16 y he ct on f the iuced pr r arisii1gl1 n th "pi r is running, and if s id n e 11.8 design d Shownn Fig. 8 it is placed against said surface 1.6 by the pressure of the spring 29, the needle being controlled in both cases by the said surface 16. This takes place in this way that the valve 10, 11 is opened more or less according to the size of the air inlet aperture so that in correspomlence therewith more or less fuel enters from the pipe 12 and from this into the air inlet opening 7. The slide therefore, regulates not only the amount of the combustion air but also, and simultaneously therewith, the amount of the fuel to be added to that air. Furthermore, by arranging the orifice of the fuel supply conduit in the frontal side of the slide 5 the speed of the combustion air is always kept approximately constant just at that place where the fuel enters into that air.

I claim l. A carluiretor, comprising, in combination, a casing having a guide-groove, one end of which is adapted to form the air supply opening; a throttle valve in said groove: means for moving this valve in the said groove; a fuel supply conduit terminating in said throttle valve, and a fuel exit aperture in this valve; a valve seat in said fuel supply conduit in front of said fuel orifice; a valve needle shiftably arranged in the said throttle valve and adapted to co-operate with said seat; and a member having an oblique abutment surface and being provided in said casing, its arrangement relatively to the said needle being such that this latter can slide along said surface, while the said throttle valve is moving.

2. A carburetor, comprising, in combination, a casing, one end of which is adapted to form the air supply opening; a throttle valve in said casing; means for moving this valve in the said casing; a fuel supply conduit terminating in said throttle valve, and a fuel exit aperture in this valve; a valve seat in said fuel supply conduit in front of said fuel orifice; a valve needle shiftably arranged in the said throttle valve and adapt ed to co-operate with said seat; a member having an oblique abutment surface and being provided in said casing, its arrangement relatively to the said needle being such that this latter can slide along said surface, while the said throttle valve is moving, and means for adjusting the obliquity of said abutment member.

'3. A carburetor, comprising, in combination, a casing, one end of which is adapted to form the air supply opening; a throttle valve in said casing; means for moving this valve in the said casing; a fuel supply c0n- .duit terminating in said throttle valve, and

a fuel exit aperture in this valve; a valve eat in said-fuel supply conduit in front of said fuel orifice; a valve needle shiftably arra ged in the aid throttle valve and adapted to cooperate with said seat; an

opening in said casing, and a shiftable block in this opening; a member having an oblique abutment surface adapted to co-operate with said valve needle and being turnable in said block; an adjusting screw for varying the obliquity of the member having said abutment surface; a spring keeping this member in contact with said screw; and means for shifting the said block in said opening of the casing.

4. A carburetor comprising, in combination, a casing, a slide therein, means for moving said slide in said casing, a fuel supply conduit terminating into the slide, and a fuel delivery opening in the slide, a valve seat in said fuel supply conduit in front of said delivery opening, a needle valve shiftable in the said slide and adapted to cooperate with said valve seat, an oblique abutment surface in the said casing at which the said needle valve slides along while the slide is in motion.

5. A carburetor comprising, in combination, a casing, one end of which is adapted to form the air supply opening, a throttle valve in said casing, means for moving this valve in the said casing, a fuel supply conduit terminating in said throttle valve, a fuel exit ape1-- ture in this valve, a valve seat in said fuel supply conduit in front of said fuel orifice, a valve needle shiftably arranged in the said throttle valve and adapted to cooperate with said seat, a spring so arranged as to be adapted to press said needle valve upon said seat, a bore formed in the throttle valve surrounding the needle, a collar carried by the needle and having a non-leaking sliding fit in said bore, and means of communication between said bore and the motor cylinder to cause a suction of the cylinder in operation to move the collar and thereby the needle in opposition to the pressure of the spring, a conduit leading from the interior of said bore to the pipe leading to the motor cylinder, and a member having an oblique abutment surface in the path of movement of the needle under the suction operation of the engine whereby to cause the needle to be moved by the abutment during movement of the thr0t t le valve. 7

In testimony whereof I aflix my signa ture.

WARLAY, MILAN. 

